10医学英语Veins

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Veins�form a low-pressure collecting system to return oxygen-poor blood to the heart.The walls of the veins are thinner and less elastic than those of the�arteries.

Veins have�valves�that enable blood to flow only toward the heart and prevent it from flowing away from the heart.

Venules�are smallest veins that join to form the larger veins.

Superficial veins�are located near the body surface.

Deep veins�are located within the tissues and away from the body surface.

词汇：

veins 静脉

arteries 动脉

valves 瓣膜

Venules 小静脉

Superficial veins 浅静脉

Deep veins 深静脉

参考译文：

静脉形成低压回收系统，回收含氧低的血液回流到心脏。静脉壁比动脉壁更薄，弹性更小。
静脉有瓣膜，它使血液只能流向心脏，并防止血液从心脏逆流。
Venules是最小的静脉，汇合形成较大的静脉。
浅静脉位于体表附近。
深静脉位于组织内部，远离体表。